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致密气藏束缚水分布规律及含气饱和度研究
引用本文:孙军昌,杨正明,唐立根,晏军.致密气藏束缚水分布规律及含气饱和度研究[J].深圳大学学报(理工版),2011,28(5):377-383.
作者姓名:孙军昌  杨正明  唐立根  晏军
作者单位:1. 中国科学院渗流流体力学研究所,河北廊坊065007;中国科学院研究生院,北京100049
2. 中国石油勘探开发研究院廊坊分院,河北廊坊,065007
基金项目:国家重点基础研究发展规划基金资助项目(2007CB209500); 国家自然科学基金资助项目(10672187)~~
摘    要:油气藏储层含气(油)饱和度是储量计算、储层评价及制定合理开发方案的关键参数之一.针对致密砂岩气藏孔喉细微、毛管力和束缚水饱和度较高的特点,经气水离心实验优选认为,2.07 MPa是致密砂岩气藏岩样的合适离心力,传统使用的0.69 MPa及适合于低渗油藏的1.38 MPa离心力均不适用于致密气藏.结合毛管压力方程,计算得到致密砂岩气藏储层有效渗流喉道半径下限为0.07μm.结合低磁场核磁共振弛豫谱技术,发现致密气藏束缚水并不完全分布在微孔隙中,被小喉道所控制的较大孔隙中仍含有约16.39%的束缚水,这与该类储层喉道半径较小、孔喉半径较大有关.与密闭取心岩样核磁共振实验结果对比表明,优选离心力2.07 MPa的离心实验结果与气藏原始状态束缚水分布规律及原始含气饱和度具有很好的一致性.致密气藏束缚水饱和度较高,初始含气饱和度仅为26.76%.

关 键 词:油气藏开发  致密砂岩气藏  含气饱和度  核磁共振  束缚水  孔隙结构

Study on distribution law of irreducible water andgas saturation of tight sandstone gas reservoir
SUN Jun-chang,YANG Zheng-ming,TANG Li-gen,YAN Jun.Study on distribution law of irreducible water andgas saturation of tight sandstone gas reservoir[J].Journal of Shenzhen University(Science &engineering),2011,28(5):377-383.
Authors:SUN Jun-chang  YANG Zheng-ming  TANG Li-gen  YAN Jun
Affiliation:SUN Jun-chang1,3,YANG Zheng-ming2,TANG Li-gen2,and YAN Jun1,31) Institute of Porous Flow& Fluid Mechanics,Chinese Academy of SciencesHebei ProvinceLangfang065007P.R.China2) Research Institute of Petroleum Exploration and Development-Langfang,Hebei ProvinceLangfang065007P.R.China3) Graduate University of Chinese Academy of Sciences,Beijing100049P.R.China
Abstract:Initial oil or gas saturation is one of the most important parameters to calculate and evaluate the reserves.A set of various centrifugal forces were used in the centrifugal experiment in order to find the suitable force corre-sponding to the tight gas reservoir.The experiment indicated that2.07 MPa was suitable and the classical centrifugalforces such as 0.69 MPa and 1.38 MPa were less appropriate to the tight gas reservoir.Combined with the Laplaceequation,results indicated thatthe lower limitof the effec...
Keywords:petroleum development  tight sandstone gas reservoir  gas saturation  nuclear magnetic resonance(NMR)  irreducible water  pore structure  
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